drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/kernel.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/slab.h>
  35 #include <linux/fb.h>
  36 #include <linux/module.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_crtc_helper.h>
  41
  42 static LIST_HEAD(kernel_fb_helper_list);
  43
  44 /**
  45  * DOC: fbdev helpers
  46  *
  47  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  48  * mode setting driver. They can be used mostly independently from the crtc
  49  * helper functions used by many drivers to implement the kernel mode setting
  50  * interfaces.
  51  *
  52  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  53  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  54  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  55  * default behaviour can override the third step with their own code.
  56  * Teardown is done with drm_fb_helper_fini().
  57  *
  58  * At runtime drivers should restore the fbdev console by calling
  59  * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
  60  * They should also notify the fb helper code from updates to the output
  61  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  62  * integration with the output polling code in drm_crtc_helper.c the modeset
  63  * code provides a ->output_poll_changed callback.
  64  *
  65  * All other functions exported by the fb helper library can be used to
  66  * implement the fbdev driver interface by the driver.
  67  *
  68  * It is possible, though perhaps somewhat tricky, to implement race-free
  69  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  70  * helper must be called first to initialize the minimum required to make
  71  * hotplug detection work. Drivers also need to make sure to properly set up
  72  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  73  * it is safe to enable interrupts and start processing hotplug events. At the
  74  * same time, drivers should initialize all modeset objects such as CRTCs,
  75  * encoders and connectors. To finish up the fbdev helper initialization, the
  76  * drm_fb_helper_init() function is called. To probe for all attached displays
  77  * and set up an initial configuration using the detected hardware, drivers
  78  * should call drm_fb_helper_single_add_all_connectors() followed by
  79  * drm_fb_helper_initial_config().
  80  */
  81
  82 /**
  83  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  84  *                                             emulation helper
  85  * @fb_helper: fbdev initialized with drm_fb_helper_init
  86  *
  87  * This functions adds all the available connectors for use with the given
  88  * fb_helper. This is a separate step to allow drivers to freely assign
  89  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  90  * not adequate to be used for the fbcon.
  91  *
  92  * This function is protected against concurrent connector hotadds/removals
  93  * using drm_fb_helper_add_one_connector() and
  94  * drm_fb_helper_remove_one_connector().
  95  */
  96 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  97 {
  98         struct drm_device *dev = fb_helper->dev;
  99         struct drm_connector *connector;
 100         int i;
 101
 102         mutex_lock(&dev->mode_config.mutex);
 103         drm_for_each_connector(connector, dev) {
 104                 struct drm_fb_helper_connector *fb_helper_connector;
 105
 106                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 107                 if (!fb_helper_connector)
 108                         goto fail;
 109
 110                 fb_helper_connector->connector = connector;
 111                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 112         }
 113         mutex_unlock(&dev->mode_config.mutex);
 114         return 0;
 115 fail:
 116         for (i = 0; i < fb_helper->connector_count; i++) {
 117                 kfree(fb_helper->connector_info[i]);
 118                 fb_helper->connector_info[i] = NULL;
 119         }
 120         fb_helper->connector_count = 0;
 121         mutex_unlock(&dev->mode_config.mutex);
 122
 123         return -ENOMEM;
 124 }
 125 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 126
 127 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 128 {
 129         struct drm_fb_helper_connector **temp;
 130         struct drm_fb_helper_connector *fb_helper_connector;
 131
 132         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 133         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 134                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 135                 if (!temp)
 136                         return -ENOMEM;
 137
 138                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 139                 fb_helper->connector_info = temp;
 140         }
 141
 142
 143         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 144         if (!fb_helper_connector)
 145                 return -ENOMEM;
 146
 147         fb_helper_connector->connector = connector;
 148         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 152
 153 static void remove_from_modeset(struct drm_mode_set *set,
 154                 struct drm_connector *connector)
 155 {
 156         int i, j;
 157
 158         for (i = 0; i < set->num_connectors; i++) {
 159                 if (set->connectors[i] == connector)
 160                         break;
 161         }
 162
 163         if (i == set->num_connectors)
 164                 return;
 165
 166         for (j = i + 1; j < set->num_connectors; j++) {
 167                 set->connectors[j - 1] = set->connectors[j];
 168         }
 169         set->num_connectors--;
 170
 171         /*
 172          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 173          */
 174         if (set->num_connectors == 0) {
 175                 set->fb = NULL;
 176                 drm_mode_destroy(connector->dev, set->mode);
 177                 set->mode = NULL;
 178         }
 179 }
 180
 181 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 182                                        struct drm_connector *connector)
 183 {
 184         struct drm_fb_helper_connector *fb_helper_connector;
 185         int i, j;
 186
 187         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 188
 189         for (i = 0; i < fb_helper->connector_count; i++) {
 190                 if (fb_helper->connector_info[i]->connector == connector)
 191                         break;
 192         }
 193
 194         if (i == fb_helper->connector_count)
 195                 return -EINVAL;
 196         fb_helper_connector = fb_helper->connector_info[i];
 197
 198         for (j = i + 1; j < fb_helper->connector_count; j++) {
 199                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 200         }
 201         fb_helper->connector_count--;
 202         kfree(fb_helper_connector);
 203
 204         /* also cleanup dangling references to the connector: */
 205         for (i = 0; i < fb_helper->crtc_count; i++)
 206                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 207
 208         return 0;
 209 }
 210 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 211
 212 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 213 {
 214         uint16_t *r_base, *g_base, *b_base;
 215         int i;
 216
 217         if (helper->funcs->gamma_get == NULL)
 218                 return;
 219
 220         r_base = crtc->gamma_store;
 221         g_base = r_base + crtc->gamma_size;
 222         b_base = g_base + crtc->gamma_size;
 223
 224         for (i = 0; i < crtc->gamma_size; i++)
 225                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 226 }
 227
 228 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 229 {
 230         uint16_t *r_base, *g_base, *b_base;
 231
 232         if (crtc->funcs->gamma_set == NULL)
 233                 return;
 234
 235         r_base = crtc->gamma_store;
 236         g_base = r_base + crtc->gamma_size;
 237         b_base = g_base + crtc->gamma_size;
 238
 239         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 240 }
 241
 242 /**
 243  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 244  * @info: fbdev registered by the helper
 245  */
 246 int drm_fb_helper_debug_enter(struct fb_info *info)
 247 {
 248         struct drm_fb_helper *helper = info->par;
 249         const struct drm_crtc_helper_funcs *funcs;
 250         int i;
 251
 252         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 253                 for (i = 0; i < helper->crtc_count; i++) {
 254                         struct drm_mode_set *mode_set =
 255                                 &helper->crtc_info[i].mode_set;
 256
 257                         if (!mode_set->crtc->enabled)
 258                                 continue;
 259
 260                         funcs = mode_set->crtc->helper_private;
 261                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 262                         funcs->mode_set_base_atomic(mode_set->crtc,
 263                                                     mode_set->fb,
 264                                                     mode_set->x,
 265                                                     mode_set->y,
 266                                                     ENTER_ATOMIC_MODE_SET);
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 273
 274 /* Find the real fb for a given fb helper CRTC */
 275 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 276 {
 277         struct drm_device *dev = crtc->dev;
 278         struct drm_crtc *c;
 279
 280         drm_for_each_crtc(c, dev) {
 281                 if (crtc->base.id == c->base.id)
 282                         return c->primary->fb;
 283         }
 284
 285         return NULL;
 286 }
 287
 288 /**
 289  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 290  * @info: fbdev registered by the helper
 291  */
 292 int drm_fb_helper_debug_leave(struct fb_info *info)
 293 {
 294         struct drm_fb_helper *helper = info->par;
 295         struct drm_crtc *crtc;
 296         const struct drm_crtc_helper_funcs *funcs;
 297         struct drm_framebuffer *fb;
 298         int i;
 299
 300         for (i = 0; i < helper->crtc_count; i++) {
 301                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 302                 crtc = mode_set->crtc;
 303                 funcs = crtc->helper_private;
 304                 fb = drm_mode_config_fb(crtc);
 305
 306                 if (!crtc->enabled)
 307                         continue;
 308
 309                 if (!fb) {
 310                         DRM_ERROR("no fb to restore??\n");
 311                         continue;
 312                 }
 313
 314                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 315                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 316                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 317         }
 318
 319         return 0;
 320 }
 321 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 322
 323 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 324 {
 325         struct drm_device *dev = fb_helper->dev;
 326         struct drm_plane *plane;
 327         int i;
 328
 329         drm_warn_on_modeset_not_all_locked(dev);
 330
 331         drm_for_each_plane(plane, dev) {
 332                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 333                         drm_plane_force_disable(plane);
 334
 335                 if (dev->mode_config.rotation_property) {
 336                         drm_mode_plane_set_obj_prop(plane,
 337                                                     dev->mode_config.rotation_property,
 338                                                     BIT(DRM_ROTATE_0));
 339                 }
 340         }
 341
 342         for (i = 0; i < fb_helper->crtc_count; i++) {
 343                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 344                 struct drm_crtc *crtc = mode_set->crtc;
 345                 int ret;
 346
 347                 if (crtc->funcs->cursor_set) {
 348                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 349                         if (ret)
 350                                 return ret;
 351                 }
 352
 353                 ret = drm_mode_set_config_internal(mode_set);
 354                 if (ret)
 355                         return ret;
 356         }
 357
 358         return 0;
 359 }
 360
 361 /**
 362  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 363  * @fb_helper: fbcon to restore
 364  *
 365  * This should be called from driver's drm ->lastclose callback
 366  * when implementing an fbcon on top of kms using this helper. This ensures that
 367  * the user isn't greeted with a black screen when e.g. X dies.
 368  *
 369  * RETURNS:
 370  * Zero if everything went ok, negative error code otherwise.
 371  */
 372 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 373 {
 374         struct drm_device *dev = fb_helper->dev;
 375         bool do_delayed;
 376         int ret;
 377
 378         drm_modeset_lock_all(dev);
 379         ret = restore_fbdev_mode(fb_helper);
 380
 381         do_delayed = fb_helper->delayed_hotplug;
 382         if (do_delayed)
 383                 fb_helper->delayed_hotplug = false;
 384         drm_modeset_unlock_all(dev);
 385
 386         if (do_delayed)
 387                 drm_fb_helper_hotplug_event(fb_helper);
 388         return ret;
 389 }
 390 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 391
 392 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 393 {
 394         struct drm_device *dev = fb_helper->dev;
 395         struct drm_crtc *crtc;
 396         int bound = 0, crtcs_bound = 0;
 397
 398         /* Sometimes user space wants everything disabled, so don't steal the
 399          * display if there's a master. */
 400         if (dev->primary->master)
 401                 return false;
 402
 403         drm_for_each_crtc(crtc, dev) {
 404                 if (crtc->primary->fb)
 405                         crtcs_bound++;
 406                 if (crtc->primary->fb == fb_helper->fb)
 407                         bound++;
 408         }
 409
 410         if (bound < crtcs_bound)
 411                 return false;
 412
 413         return true;
 414 }
 415
 416 #ifdef CONFIG_MAGIC_SYSRQ
 417 /*
 418  * restore fbcon display for all kms driver's using this helper, used for sysrq
 419  * and panic handling.
 420  */
 421 static bool drm_fb_helper_force_kernel_mode(void)
 422 {
 423         bool ret, error = false;
 424         struct drm_fb_helper *helper;
 425
 426         if (list_empty(&kernel_fb_helper_list))
 427                 return false;
 428
 429         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 430                 struct drm_device *dev = helper->dev;
 431
 432                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 433                         continue;
 434
 435                 drm_modeset_lock_all(dev);
 436                 ret = restore_fbdev_mode(helper);
 437                 if (ret)
 438                         error = true;
 439                 drm_modeset_unlock_all(dev);
 440         }
 441         return error;
 442 }
 443
 444 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 445 {
 446         bool ret;
 447         ret = drm_fb_helper_force_kernel_mode();
 448         if (ret == true)
 449                 DRM_ERROR("Failed to restore crtc configuration\n");
 450 }
 451 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 452
 453 static void drm_fb_helper_sysrq(int dummy1)
 454 {
 455         schedule_work(&drm_fb_helper_restore_work);
 456 }
 457
 458 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 459         .handler = drm_fb_helper_sysrq,
 460         .help_msg = "force-fb(V)",
 461         .action_msg = "Restore framebuffer console",
 462 };
 463 #else
 464 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 465 #endif
 466
 467 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 468 {
 469         struct drm_fb_helper *fb_helper = info->par;
 470         struct drm_device *dev = fb_helper->dev;
 471         struct drm_crtc *crtc;
 472         struct drm_connector *connector;
 473         int i, j;
 474
 475         /*
 476          * For each CRTC in this fb, turn the connectors on/off.
 477          */
 478         drm_modeset_lock_all(dev);
 479         if (!drm_fb_helper_is_bound(fb_helper)) {
 480                 drm_modeset_unlock_all(dev);
 481                 return;
 482         }
 483
 484         for (i = 0; i < fb_helper->crtc_count; i++) {
 485                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 486
 487                 if (!crtc->enabled)
 488                         continue;
 489
 490                 /* Walk the connectors & encoders on this fb turning them on/off */
 491                 for (j = 0; j < fb_helper->connector_count; j++) {
 492                         connector = fb_helper->connector_info[j]->connector;
 493                         connector->funcs->dpms(connector, dpms_mode);
 494                         drm_object_property_set_value(&connector->base,
 495                                 dev->mode_config.dpms_property, dpms_mode);
 496                 }
 497         }
 498         drm_modeset_unlock_all(dev);
 499 }
 500
 501 /**
 502  * drm_fb_helper_blank - implementation for ->fb_blank
 503  * @blank: desired blanking state
 504  * @info: fbdev registered by the helper
 505  */
 506 int drm_fb_helper_blank(int blank, struct fb_info *info)
 507 {
 508         if (oops_in_progress)
 509                 return -EBUSY;
 510
 511         switch (blank) {
 512         /* Display: On; HSync: On, VSync: On */
 513         case FB_BLANK_UNBLANK:
 514                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 515                 break;
 516         /* Display: Off; HSync: On, VSync: On */
 517         case FB_BLANK_NORMAL:
 518                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 519                 break;
 520         /* Display: Off; HSync: Off, VSync: On */
 521         case FB_BLANK_HSYNC_SUSPEND:
 522                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 523                 break;
 524         /* Display: Off; HSync: On, VSync: Off */
 525         case FB_BLANK_VSYNC_SUSPEND:
 526                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 527                 break;
 528         /* Display: Off; HSync: Off, VSync: Off */
 529         case FB_BLANK_POWERDOWN:
 530                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 531                 break;
 532         }
 533         return 0;
 534 }
 535 EXPORT_SYMBOL(drm_fb_helper_blank);
 536
 537 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 538 {
 539         int i;
 540
 541         for (i = 0; i < helper->connector_count; i++)
 542                 kfree(helper->connector_info[i]);
 543         kfree(helper->connector_info);
 544         for (i = 0; i < helper->crtc_count; i++) {
 545                 kfree(helper->crtc_info[i].mode_set.connectors);
 546                 if (helper->crtc_info[i].mode_set.mode)
 547                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 548         }
 549         kfree(helper->crtc_info);
 550 }
 551
 552 /**
 553  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 554  * @dev: DRM device
 555  * @helper: driver-allocated fbdev helper structure to set up
 556  * @funcs: pointer to structure of functions associate with this helper
 557  *
 558  * Sets up the bare minimum to make the framebuffer helper usable. This is
 559  * useful to implement race-free initialization of the polling helpers.
 560  */
 561 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 562                            const struct drm_fb_helper_funcs *funcs)
 563 {
 564         INIT_LIST_HEAD(&helper->kernel_fb_list);
 565         helper->funcs = funcs;
 566         helper->dev = dev;
 567 }
 568 EXPORT_SYMBOL(drm_fb_helper_prepare);
 569
 570 /**
 571  * drm_fb_helper_init - initialize a drm_fb_helper structure
 572  * @dev: drm device
 573  * @fb_helper: driver-allocated fbdev helper structure to initialize
 574  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 575  * @max_conn_count: max connector count
 576  *
 577  * This allocates the structures for the fbdev helper with the given limits.
 578  * Note that this won't yet touch the hardware (through the driver interfaces)
 579  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 580  * to allow driver writes more control over the exact init sequence.
 581  *
 582  * Drivers must call drm_fb_helper_prepare() before calling this function.
 583  *
 584  * RETURNS:
 585  * Zero if everything went ok, nonzero otherwise.
 586  */
 587 int drm_fb_helper_init(struct drm_device *dev,
 588                        struct drm_fb_helper *fb_helper,
 589                        int crtc_count, int max_conn_count)
 590 {
 591         struct drm_crtc *crtc;
 592         int i;
 593
 594         if (!max_conn_count)
 595                 return -EINVAL;
 596
 597         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 598         if (!fb_helper->crtc_info)
 599                 return -ENOMEM;
 600
 601         fb_helper->crtc_count = crtc_count;
 602         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 603         if (!fb_helper->connector_info) {
 604                 kfree(fb_helper->crtc_info);
 605                 return -ENOMEM;
 606         }
 607         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 608         fb_helper->connector_count = 0;
 609
 610         for (i = 0; i < crtc_count; i++) {
 611                 fb_helper->crtc_info[i].mode_set.connectors =
 612                         kcalloc(max_conn_count,
 613                                 sizeof(struct drm_connector *),
 614                                 GFP_KERNEL);
 615
 616                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 617                         goto out_free;
 618                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 619         }
 620
 621         i = 0;
 622         drm_for_each_crtc(crtc, dev) {
 623                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 624                 i++;
 625         }
 626
 627         return 0;
 628 out_free:
 629         drm_fb_helper_crtc_free(fb_helper);
 630         return -ENOMEM;
 631 }
 632 EXPORT_SYMBOL(drm_fb_helper_init);
 633
 634 /**
 635  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 636  * @fb_helper: driver-allocated fbdev helper
 637  *
 638  * A helper to alloc fb_info and the members cmap and apertures. Called
 639  * by the driver within the fb_probe fb_helper callback function.
 640  *
 641  * RETURNS:
 642  * fb_info pointer if things went okay, pointer containing error code
 643  * otherwise
 644  */
 645 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 646 {
 647         struct device *dev = fb_helper->dev->dev;
 648         struct fb_info *info;
 649         int ret;
 650
 651         info = framebuffer_alloc(0, dev);
 652         if (!info)
 653                 return ERR_PTR(-ENOMEM);
 654
 655         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 656         if (ret)
 657                 goto err_release;
 658
 659         info->apertures = alloc_apertures(1);
 660         if (!info->apertures) {
 661                 ret = -ENOMEM;
 662                 goto err_free_cmap;
 663         }
 664
 665         fb_helper->fbdev = info;
 666
 667         return info;
 668
 669 err_free_cmap:
 670         fb_dealloc_cmap(&info->cmap);
 671 err_release:
 672         framebuffer_release(info);
 673         return ERR_PTR(ret);
 674 }
 675 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 676
 677 /**
 678  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 679  * @fb_helper: driver-allocated fbdev helper
 680  *
 681  * A wrapper around unregister_framebuffer, to release the fb_info
 682  * framebuffer device
 683  */
 684 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 685 {
 686         if (fb_helper && fb_helper->fbdev)
 687                 unregister_framebuffer(fb_helper->fbdev);
 688 }
 689 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 690
 691 /**
 692  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 693  * @fb_helper: driver-allocated fbdev helper
 694  *
 695  * A helper to free memory taken by fb_info and the members cmap and
 696  * apertures
 697  */
 698 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 699 {
 700         if (fb_helper) {
 701                 struct fb_info *info = fb_helper->fbdev;
 702
 703                 if (info) {
 704                         if (info->cmap.len)
 705                                 fb_dealloc_cmap(&info->cmap);
 706                         framebuffer_release(info);
 707                 }
 708
 709                 fb_helper->fbdev = NULL;
 710         }
 711 }
 712 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 713
 714 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 715 {
 716         if (!list_empty(&fb_helper->kernel_fb_list)) {
 717                 list_del(&fb_helper->kernel_fb_list);
 718                 if (list_empty(&kernel_fb_helper_list)) {
 719                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 720                 }
 721         }
 722
 723         drm_fb_helper_crtc_free(fb_helper);
 724
 725 }
 726 EXPORT_SYMBOL(drm_fb_helper_fini);
 727
 728 /**
 729  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 730  * @fb_helper: driver-allocated fbdev helper
 731  *
 732  * A wrapper around unlink_framebuffer implemented by fbdev core
 733  */
 734 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 735 {
 736         if (fb_helper && fb_helper->fbdev)
 737                 unlink_framebuffer(fb_helper->fbdev);
 738 }
 739 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 740
 741 /**
 742  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 743  * @info: fb_info struct pointer
 744  * @buf: userspace buffer to read from framebuffer memory
 745  * @count: number of bytes to read from framebuffer memory
 746  * @ppos: read offset within framebuffer memory
 747  *
 748  * A wrapper around fb_sys_read implemented by fbdev core
 749  */
 750 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 751                                size_t count, loff_t *ppos)
 752 {
 753         return fb_sys_read(info, buf, count, ppos);
 754 }
 755 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 756
 757 /**
 758  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 759  * @info: fb_info struct pointer
 760  * @buf: userspace buffer to write to framebuffer memory
 761  * @count: number of bytes to write to framebuffer memory
 762  * @ppos: write offset within framebuffer memory
 763  *
 764  * A wrapper around fb_sys_write implemented by fbdev core
 765  */
 766 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 767                                 size_t count, loff_t *ppos)
 768 {
 769         return fb_sys_write(info, buf, count, ppos);
 770 }
 771 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 772
 773 /**
 774  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 775  * @info: fbdev registered by the helper
 776  * @rect: info about rectangle to fill
 777  *
 778  * A wrapper around sys_fillrect implemented by fbdev core
 779  */
 780 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 781                                 const struct fb_fillrect *rect)
 782 {
 783         sys_fillrect(info, rect);
 784 }
 785 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 786
 787 /**
 788  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 789  * @info: fbdev registered by the helper
 790  * @area: info about area to copy
 791  *
 792  * A wrapper around sys_copyarea implemented by fbdev core
 793  */
 794 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 795                                 const struct fb_copyarea *area)
 796 {
 797         sys_copyarea(info, area);
 798 }
 799 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 800
 801 /**
 802  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 803  * @info: fbdev registered by the helper
 804  * @image: info about image to blit
 805  *
 806  * A wrapper around sys_imageblit implemented by fbdev core
 807  */
 808 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 809                                  const struct fb_image *image)
 810 {
 811         sys_imageblit(info, image);
 812 }
 813 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 814
 815 /**
 816  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 817  * @info: fbdev registered by the helper
 818  * @rect: info about rectangle to fill
 819  *
 820  * A wrapper around cfb_imageblit implemented by fbdev core
 821  */
 822 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 823                                 const struct fb_fillrect *rect)
 824 {
 825         cfb_fillrect(info, rect);
 826 }
 827 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 828
 829 /**
 830  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 831  * @info: fbdev registered by the helper
 832  * @area: info about area to copy
 833  *
 834  * A wrapper around cfb_copyarea implemented by fbdev core
 835  */
 836 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 837                                 const struct fb_copyarea *area)
 838 {
 839         cfb_copyarea(info, area);
 840 }
 841 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 842
 843 /**
 844  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 845  * @info: fbdev registered by the helper
 846  * @image: info about image to blit
 847  *
 848  * A wrapper around cfb_imageblit implemented by fbdev core
 849  */
 850 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 851                                  const struct fb_image *image)
 852 {
 853         cfb_imageblit(info, image);
 854 }
 855 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 856
 857 /**
 858  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 859  * @fb_helper: driver-allocated fbdev helper
 860  * @state: desired state, zero to resume, non-zero to suspend
 861  *
 862  * A wrapper around fb_set_suspend implemented by fbdev core
 863  */
 864 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 865 {
 866         if (fb_helper && fb_helper->fbdev)
 867                 fb_set_suspend(fb_helper->fbdev, state);
 868 }
 869 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 870
 871 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 872                      u16 blue, u16 regno, struct fb_info *info)
 873 {
 874         struct drm_fb_helper *fb_helper = info->par;
 875         struct drm_framebuffer *fb = fb_helper->fb;
 876         int pindex;
 877
 878         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 879                 u32 *palette;
 880                 u32 value;
 881                 /* place color in psuedopalette */
 882                 if (regno > 16)
 883                         return -EINVAL;
 884                 palette = (u32 *)info->pseudo_palette;
 885                 red >>= (16 - info->var.red.length);
 886                 green >>= (16 - info->var.green.length);
 887                 blue >>= (16 - info->var.blue.length);
 888                 value = (red << info->var.red.offset) |
 889                         (green << info->var.green.offset) |
 890                         (blue << info->var.blue.offset);
 891                 if (info->var.transp.length > 0) {
 892                         u32 mask = (1 << info->var.transp.length) - 1;
 893                         mask <<= info->var.transp.offset;
 894                         value |= mask;
 895                 }
 896                 palette[regno] = value;
 897                 return 0;
 898         }
 899
 900         /*
 901          * The driver really shouldn't advertise pseudo/directcolor
 902          * visuals if it can't deal with the palette.
 903          */
 904         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 905                     !fb_helper->funcs->gamma_get))
 906                 return -EINVAL;
 907
 908         pindex = regno;
 909
 910         if (fb->bits_per_pixel == 16) {
 911                 pindex = regno << 3;
 912
 913                 if (fb->depth == 16 && regno > 63)
 914                         return -EINVAL;
 915                 if (fb->depth == 15 && regno > 31)
 916                         return -EINVAL;
 917
 918                 if (fb->depth == 16) {
 919                         u16 r, g, b;
 920                         int i;
 921                         if (regno < 32) {
 922                                 for (i = 0; i < 8; i++)
 923                                         fb_helper->funcs->gamma_set(crtc, red,
 924                                                 green, blue, pindex + i);
 925                         }
 926
 927                         fb_helper->funcs->gamma_get(crtc, &r,
 928                                                     &g, &b,
 929                                                     pindex >> 1);
 930
 931                         for (i = 0; i < 4; i++)
 932                                 fb_helper->funcs->gamma_set(crtc, r,
 933                                                             green, b,
 934                                                             (pindex >> 1) + i);
 935                 }
 936         }
 937
 938         if (fb->depth != 16)
 939                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 940         return 0;
 941 }
 942
 943 /**
 944  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 945  * @cmap: cmap to set
 946  * @info: fbdev registered by the helper
 947  */
 948 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 949 {
 950         struct drm_fb_helper *fb_helper = info->par;
 951         struct drm_device *dev = fb_helper->dev;
 952         const struct drm_crtc_helper_funcs *crtc_funcs;
 953         u16 *red, *green, *blue, *transp;
 954         struct drm_crtc *crtc;
 955         int i, j, rc = 0;
 956         int start;
 957
 958         if (oops_in_progress)
 959                 return -EBUSY;
 960
 961         drm_modeset_lock_all(dev);
 962         if (!drm_fb_helper_is_bound(fb_helper)) {
 963                 drm_modeset_unlock_all(dev);
 964                 return -EBUSY;
 965         }
 966
 967         for (i = 0; i < fb_helper->crtc_count; i++) {
 968                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 969                 crtc_funcs = crtc->helper_private;
 970
 971                 red = cmap->red;
 972                 green = cmap->green;
 973                 blue = cmap->blue;
 974                 transp = cmap->transp;
 975                 start = cmap->start;
 976
 977                 for (j = 0; j < cmap->len; j++) {
 978                         u16 hred, hgreen, hblue, htransp = 0xffff;
 979
 980                         hred = *red++;
 981                         hgreen = *green++;
 982                         hblue = *blue++;
 983
 984                         if (transp)
 985                                 htransp = *transp++;
 986
 987                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 988                         if (rc)
 989                                 goto out;
 990                 }
 991                 if (crtc_funcs->load_lut)
 992                         crtc_funcs->load_lut(crtc);
 993         }
 994  out:
 995         drm_modeset_unlock_all(dev);
 996         return rc;
 997 }
 998 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 999
1000 /**
1001  * drm_fb_helper_check_var - implementation for ->fb_check_var
1002  * @var: screeninfo to check
1003  * @info: fbdev registered by the helper
1004  */
1005 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1006                             struct fb_info *info)
1007 {
1008         struct drm_fb_helper *fb_helper = info->par;
1009         struct drm_framebuffer *fb = fb_helper->fb;
1010         int depth;
1011
1012         if (var->pixclock != 0 || in_dbg_master())
1013                 return -EINVAL;
1014
1015         /* Need to resize the fb object !!! */
1016         if (var->bits_per_pixel > fb->bits_per_pixel ||
1017             var->xres > fb->width || var->yres > fb->height ||
1018             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1019                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1020                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1021                           var->xres, var->yres, var->bits_per_pixel,
1022                           var->xres_virtual, var->yres_virtual,
1023                           fb->width, fb->height, fb->bits_per_pixel);
1024                 return -EINVAL;
1025         }
1026
1027         switch (var->bits_per_pixel) {
1028         case 16:
1029                 depth = (var->green.length == 6) ? 16 : 15;
1030                 break;
1031         case 32:
1032                 depth = (var->transp.length > 0) ? 32 : 24;
1033                 break;
1034         default:
1035                 depth = var->bits_per_pixel;
1036                 break;
1037         }
1038
1039         switch (depth) {
1040         case 8:
1041                 var->red.offset = 0;
1042                 var->green.offset = 0;
1043                 var->blue.offset = 0;
1044                 var->red.length = 8;
1045                 var->green.length = 8;
1046                 var->blue.length = 8;
1047                 var->transp.length = 0;
1048                 var->transp.offset = 0;
1049                 break;
1050         case 15:
1051                 var->red.offset = 10;
1052                 var->green.offset = 5;
1053                 var->blue.offset = 0;
1054                 var->red.length = 5;
1055                 var->green.length = 5;
1056                 var->blue.length = 5;
1057                 var->transp.length = 1;
1058                 var->transp.offset = 15;
1059                 break;
1060         case 16:
1061                 var->red.offset = 11;
1062                 var->green.offset = 5;
1063                 var->blue.offset = 0;
1064                 var->red.length = 5;
1065                 var->green.length = 6;
1066                 var->blue.length = 5;
1067                 var->transp.length = 0;
1068                 var->transp.offset = 0;
1069                 break;
1070         case 24:
1071                 var->red.offset = 16;
1072                 var->green.offset = 8;
1073                 var->blue.offset = 0;
1074                 var->red.length = 8;
1075                 var->green.length = 8;
1076                 var->blue.length = 8;
1077                 var->transp.length = 0;
1078                 var->transp.offset = 0;
1079                 break;
1080         case 32:
1081                 var->red.offset = 16;
1082                 var->green.offset = 8;
1083                 var->blue.offset = 0;
1084                 var->red.length = 8;
1085                 var->green.length = 8;
1086                 var->blue.length = 8;
1087                 var->transp.length = 8;
1088                 var->transp.offset = 24;
1089                 break;
1090         default:
1091                 return -EINVAL;
1092         }
1093         return 0;
1094 }
1095 EXPORT_SYMBOL(drm_fb_helper_check_var);
1096
1097 /**
1098  * drm_fb_helper_set_par - implementation for ->fb_set_par
1099  * @info: fbdev registered by the helper
1100  *
1101  * This will let fbcon do the mode init and is called at initialization time by
1102  * the fbdev core when registering the driver, and later on through the hotplug
1103  * callback.
1104  */
1105 int drm_fb_helper_set_par(struct fb_info *info)
1106 {
1107         struct drm_fb_helper *fb_helper = info->par;
1108         struct fb_var_screeninfo *var = &info->var;
1109
1110         if (oops_in_progress)
1111                 return -EBUSY;
1112
1113         if (var->pixclock != 0) {
1114                 DRM_ERROR("PIXEL CLOCK SET\n");
1115                 return -EINVAL;
1116         }
1117
1118         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1119
1120         return 0;
1121 }
1122 EXPORT_SYMBOL(drm_fb_helper_set_par);
1123
1124 /**
1125  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1126  * @var: updated screen information
1127  * @info: fbdev registered by the helper
1128  */
1129 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1130                               struct fb_info *info)
1131 {
1132         struct drm_fb_helper *fb_helper = info->par;
1133         struct drm_device *dev = fb_helper->dev;
1134         struct drm_mode_set *modeset;
1135         int ret = 0;
1136         int i;
1137
1138         if (oops_in_progress)
1139                 return -EBUSY;
1140
1141         drm_modeset_lock_all(dev);
1142         if (!drm_fb_helper_is_bound(fb_helper)) {
1143                 drm_modeset_unlock_all(dev);
1144                 return -EBUSY;
1145         }
1146
1147         for (i = 0; i < fb_helper->crtc_count; i++) {
1148                 modeset = &fb_helper->crtc_info[i].mode_set;
1149
1150                 modeset->x = var->xoffset;
1151                 modeset->y = var->yoffset;
1152
1153                 if (modeset->num_connectors) {
1154                         ret = drm_mode_set_config_internal(modeset);
1155                         if (!ret) {
1156                                 info->var.xoffset = var->xoffset;
1157                                 info->var.yoffset = var->yoffset;
1158                         }
1159                 }
1160         }
1161         drm_modeset_unlock_all(dev);
1162         return ret;
1163 }
1164 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1165
1166 /*
1167  * Allocates the backing storage and sets up the fbdev info structure through
1168  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1169  * notifier.
1170  */
1171 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1172                                          int preferred_bpp)
1173 {
1174         int ret = 0;
1175         int crtc_count = 0;
1176         int i;
1177         struct fb_info *info;
1178         struct drm_fb_helper_surface_size sizes;
1179         int gamma_size = 0;
1180
1181         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1182         sizes.surface_depth = 24;
1183         sizes.surface_bpp = 32;
1184         sizes.fb_width = (unsigned)-1;
1185         sizes.fb_height = (unsigned)-1;
1186
1187         /* if driver picks 8 or 16 by default use that
1188            for both depth/bpp */
1189         if (preferred_bpp != sizes.surface_bpp)
1190                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1191
1192         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1193         for (i = 0; i < fb_helper->connector_count; i++) {
1194                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1195                 struct drm_cmdline_mode *cmdline_mode;
1196
1197                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1198
1199                 if (cmdline_mode->bpp_specified) {
1200                         switch (cmdline_mode->bpp) {
1201                         case 8:
1202                                 sizes.surface_depth = sizes.surface_bpp = 8;
1203                                 break;
1204                         case 15:
1205                                 sizes.surface_depth = 15;
1206                                 sizes.surface_bpp = 16;
1207                                 break;
1208                         case 16:
1209                                 sizes.surface_depth = sizes.surface_bpp = 16;
1210                                 break;
1211                         case 24:
1212                                 sizes.surface_depth = sizes.surface_bpp = 24;
1213                                 break;
1214                         case 32:
1215                                 sizes.surface_depth = 24;
1216                                 sizes.surface_bpp = 32;
1217                                 break;
1218                         }
1219                         break;
1220                 }
1221         }
1222
1223         crtc_count = 0;
1224         for (i = 0; i < fb_helper->crtc_count; i++) {
1225                 struct drm_display_mode *desired_mode;
1226                 struct drm_mode_set *mode_set;
1227                 int x, y, j;
1228                 /* in case of tile group, are we the last tile vert or horiz?
1229                  * If no tile group you are always the last one both vertically
1230                  * and horizontally
1231                  */
1232                 bool lastv = true, lasth = true;
1233
1234                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1235                 mode_set = &fb_helper->crtc_info[i].mode_set;
1236
1237                 if (!desired_mode)
1238                         continue;
1239
1240                 crtc_count++;
1241
1242                 x = fb_helper->crtc_info[i].x;
1243                 y = fb_helper->crtc_info[i].y;
1244
1245                 if (gamma_size == 0)
1246                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1247
1248                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1249                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1250
1251                 for (j = 0; j < mode_set->num_connectors; j++) {
1252                         struct drm_connector *connector = mode_set->connectors[j];
1253                         if (connector->has_tile) {
1254                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1255                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1256                                 /* cloning to multiple tiles is just crazy-talk, so: */
1257                                 break;
1258                         }
1259                 }
1260
1261                 if (lasth)
1262                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1263                 if (lastv)
1264                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1265         }
1266
1267         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1268                 /* hmm everyone went away - assume VGA cable just fell out
1269                    and will come back later. */
1270                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1271                 sizes.fb_width = sizes.surface_width = 1024;
1272                 sizes.fb_height = sizes.surface_height = 768;
1273         }
1274
1275         /* push down into drivers */
1276         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1277         if (ret < 0)
1278                 return ret;
1279
1280         info = fb_helper->fbdev;
1281
1282         /*
1283          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1284          * events, but at init time drm_setup_crtcs needs to be called before
1285          * the fb is allocated (since we need to figure out the desired size of
1286          * the fb before we can allocate it ...). Hence we need to fix things up
1287          * here again.
1288          */
1289         for (i = 0; i < fb_helper->crtc_count; i++)
1290                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1291                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1292
1293
1294         info->var.pixclock = 0;
1295         if (register_framebuffer(info) < 0)
1296                 return -EINVAL;
1297
1298         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1299                         info->node, info->fix.id);
1300
1301         if (list_empty(&kernel_fb_helper_list)) {
1302                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1303         }
1304
1305         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1306
1307         return 0;
1308 }
1309
1310 /**
1311  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1312  * @info: fbdev registered by the helper
1313  * @pitch: desired pitch
1314  * @depth: desired depth
1315  *
1316  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1317  * fbdev emulations. Drivers which support acceleration methods which impose
1318  * additional constraints need to set up their own limits.
1319  *
1320  * Drivers should call this (or their equivalent setup code) from their
1321  * ->fb_probe callback.
1322  */
1323 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1324                             uint32_t depth)
1325 {
1326         info->fix.type = FB_TYPE_PACKED_PIXELS;
1327         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1328                 FB_VISUAL_TRUECOLOR;
1329         info->fix.mmio_start = 0;
1330         info->fix.mmio_len = 0;
1331         info->fix.type_aux = 0;
1332         info->fix.xpanstep = 1; /* doing it in hw */
1333         info->fix.ypanstep = 1; /* doing it in hw */
1334         info->fix.ywrapstep = 0;
1335         info->fix.accel = FB_ACCEL_NONE;
1336
1337         info->fix.line_length = pitch;
1338         return;
1339 }
1340 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1341
1342 /**
1343  * drm_fb_helper_fill_var - initalizes variable fbdev information
1344  * @info: fbdev instance to set up
1345  * @fb_helper: fb helper instance to use as template
1346  * @fb_width: desired fb width
1347  * @fb_height: desired fb height
1348  *
1349  * Sets up the variable fbdev metainformation from the given fb helper instance
1350  * and the drm framebuffer allocated in fb_helper->fb.
1351  *
1352  * Drivers should call this (or their equivalent setup code) from their
1353  * ->fb_probe callback after having allocated the fbdev backing
1354  * storage framebuffer.
1355  */
1356 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1357                             uint32_t fb_width, uint32_t fb_height)
1358 {
1359         struct drm_framebuffer *fb = fb_helper->fb;
1360         info->pseudo_palette = fb_helper->pseudo_palette;
1361         info->var.xres_virtual = fb->width;
1362         info->var.yres_virtual = fb->height;
1363         info->var.bits_per_pixel = fb->bits_per_pixel;
1364         info->var.accel_flags = FB_ACCELF_TEXT;
1365         info->var.xoffset = 0;
1366         info->var.yoffset = 0;
1367         info->var.activate = FB_ACTIVATE_NOW;
1368         info->var.height = -1;
1369         info->var.width = -1;
1370
1371         switch (fb->depth) {
1372         case 8:
1373                 info->var.red.offset = 0;
1374                 info->var.green.offset = 0;
1375                 info->var.blue.offset = 0;
1376                 info->var.red.length = 8; /* 8bit DAC */
1377                 info->var.green.length = 8;
1378                 info->var.blue.length = 8;
1379                 info->var.transp.offset = 0;
1380                 info->var.transp.length = 0;
1381                 break;
1382         case 15:
1383                 info->var.red.offset = 10;
1384                 info->var.green.offset = 5;
1385                 info->var.blue.offset = 0;
1386                 info->var.red.length = 5;
1387                 info->var.green.length = 5;
1388                 info->var.blue.length = 5;
1389                 info->var.transp.offset = 15;
1390                 info->var.transp.length = 1;
1391                 break;
1392         case 16:
1393                 info->var.red.offset = 11;
1394                 info->var.green.offset = 5;
1395                 info->var.blue.offset = 0;
1396                 info->var.red.length = 5;
1397                 info->var.green.length = 6;
1398                 info->var.blue.length = 5;
1399                 info->var.transp.offset = 0;
1400                 break;
1401         case 24:
1402                 info->var.red.offset = 16;
1403                 info->var.green.offset = 8;
1404                 info->var.blue.offset = 0;
1405                 info->var.red.length = 8;
1406                 info->var.green.length = 8;
1407                 info->var.blue.length = 8;
1408                 info->var.transp.offset = 0;
1409                 info->var.transp.length = 0;
1410                 break;
1411         case 32:
1412                 info->var.red.offset = 16;
1413                 info->var.green.offset = 8;
1414                 info->var.blue.offset = 0;
1415                 info->var.red.length = 8;
1416                 info->var.green.length = 8;
1417                 info->var.blue.length = 8;
1418                 info->var.transp.offset = 24;
1419                 info->var.transp.length = 8;
1420                 break;
1421         default:
1422                 break;
1423         }
1424
1425         info->var.xres = fb_width;
1426         info->var.yres = fb_height;
1427 }
1428 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1429
1430 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1431                                                uint32_t maxX,
1432                                                uint32_t maxY)
1433 {
1434         struct drm_connector *connector;
1435         int count = 0;
1436         int i;
1437
1438         for (i = 0; i < fb_helper->connector_count; i++) {
1439                 connector = fb_helper->connector_info[i]->connector;
1440                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1441         }
1442
1443         return count;
1444 }
1445
1446 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1447 {
1448         struct drm_display_mode *mode;
1449
1450         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1451                 if (mode->hdisplay > width ||
1452                     mode->vdisplay > height)
1453                         continue;
1454                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1455                         return mode;
1456         }
1457         return NULL;
1458 }
1459 EXPORT_SYMBOL(drm_has_preferred_mode);
1460
1461 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1462 {
1463         return fb_connector->connector->cmdline_mode.specified;
1464 }
1465
1466 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1467                                                       int width, int height)
1468 {
1469         struct drm_cmdline_mode *cmdline_mode;
1470         struct drm_display_mode *mode;
1471         bool prefer_non_interlace;
1472
1473         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1474         if (cmdline_mode->specified == false)
1475                 return NULL;
1476
1477         /* attempt to find a matching mode in the list of modes
1478          *  we have gotten so far, if not add a CVT mode that conforms
1479          */
1480         if (cmdline_mode->rb || cmdline_mode->margins)
1481                 goto create_mode;
1482
1483         prefer_non_interlace = !cmdline_mode->interlace;
1484 again:
1485         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1486                 /* check width/height */
1487                 if (mode->hdisplay != cmdline_mode->xres ||
1488                     mode->vdisplay != cmdline_mode->yres)
1489                         continue;
1490
1491                 if (cmdline_mode->refresh_specified) {
1492                         if (mode->vrefresh != cmdline_mode->refresh)
1493                                 continue;
1494                 }
1495
1496                 if (cmdline_mode->interlace) {
1497                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1498                                 continue;
1499                 } else if (prefer_non_interlace) {
1500                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1501                                 continue;
1502                 }
1503                 return mode;
1504         }
1505
1506         if (prefer_non_interlace) {
1507                 prefer_non_interlace = false;
1508                 goto again;
1509         }
1510
1511 create_mode:
1512         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1513                                                  cmdline_mode);
1514         list_add(&mode->head, &fb_helper_conn->connector->modes);
1515         return mode;
1516 }
1517 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1518
1519 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1520 {
1521         bool enable;
1522
1523         if (strict)
1524                 enable = connector->status == connector_status_connected;
1525         else
1526                 enable = connector->status != connector_status_disconnected;
1527
1528         return enable;
1529 }
1530
1531 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1532                                   bool *enabled)
1533 {
1534         bool any_enabled = false;
1535         struct drm_connector *connector;
1536         int i = 0;
1537
1538         for (i = 0; i < fb_helper->connector_count; i++) {
1539                 connector = fb_helper->connector_info[i]->connector;
1540                 enabled[i] = drm_connector_enabled(connector, true);
1541                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1542                           enabled[i] ? "yes" : "no");
1543                 any_enabled |= enabled[i];
1544         }
1545
1546         if (any_enabled)
1547                 return;
1548
1549         for (i = 0; i < fb_helper->connector_count; i++) {
1550                 connector = fb_helper->connector_info[i]->connector;
1551                 enabled[i] = drm_connector_enabled(connector, false);
1552         }
1553 }
1554
1555 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1556                               struct drm_display_mode **modes,
1557                               struct drm_fb_offset *offsets,
1558                               bool *enabled, int width, int height)
1559 {
1560         int count, i, j;
1561         bool can_clone = false;
1562         struct drm_fb_helper_connector *fb_helper_conn;
1563         struct drm_display_mode *dmt_mode, *mode;
1564
1565         /* only contemplate cloning in the single crtc case */
1566         if (fb_helper->crtc_count > 1)
1567                 return false;
1568
1569         count = 0;
1570         for (i = 0; i < fb_helper->connector_count; i++) {
1571                 if (enabled[i])
1572                         count++;
1573         }
1574
1575         /* only contemplate cloning if more than one connector is enabled */
1576         if (count <= 1)
1577                 return false;
1578
1579         /* check the command line or if nothing common pick 1024x768 */
1580         can_clone = true;
1581         for (i = 0; i < fb_helper->connector_count; i++) {
1582                 if (!enabled[i])
1583                         continue;
1584                 fb_helper_conn = fb_helper->connector_info[i];
1585                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1586                 if (!modes[i]) {
1587                         can_clone = false;
1588                         break;
1589                 }
1590                 for (j = 0; j < i; j++) {
1591                         if (!enabled[j])
1592                                 continue;
1593                         if (!drm_mode_equal(modes[j], modes[i]))
1594                                 can_clone = false;
1595                 }
1596         }
1597
1598         if (can_clone) {
1599                 DRM_DEBUG_KMS("can clone using command line\n");
1600                 return true;
1601         }
1602
1603         /* try and find a 1024x768 mode on each connector */
1604         can_clone = true;
1605         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1606
1607         for (i = 0; i < fb_helper->connector_count; i++) {
1608
1609                 if (!enabled[i])
1610                         continue;
1611
1612                 fb_helper_conn = fb_helper->connector_info[i];
1613                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1614                         if (drm_mode_equal(mode, dmt_mode))
1615                                 modes[i] = mode;
1616                 }
1617                 if (!modes[i])
1618                         can_clone = false;
1619         }
1620
1621         if (can_clone) {
1622                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1623                 return true;
1624         }
1625         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1626         return false;
1627 }
1628
1629 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1630                                 struct drm_display_mode **modes,
1631                                 struct drm_fb_offset *offsets,
1632                                 int idx,
1633                                 int h_idx, int v_idx)
1634 {
1635         struct drm_fb_helper_connector *fb_helper_conn;
1636         int i;
1637         int hoffset = 0, voffset = 0;
1638
1639         for (i = 0; i < fb_helper->connector_count; i++) {
1640                 fb_helper_conn = fb_helper->connector_info[i];
1641                 if (!fb_helper_conn->connector->has_tile)
1642                         continue;
1643
1644                 if (!modes[i] && (h_idx || v_idx)) {
1645                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1646                                       fb_helper_conn->connector->base.id);
1647                         continue;
1648                 }
1649                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1650                         hoffset += modes[i]->hdisplay;
1651
1652                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1653                         voffset += modes[i]->vdisplay;
1654         }
1655         offsets[idx].x = hoffset;
1656         offsets[idx].y = voffset;
1657         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1658         return 0;
1659 }
1660
1661 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1662                                  struct drm_display_mode **modes,
1663                                  struct drm_fb_offset *offsets,
1664                                  bool *enabled, int width, int height)
1665 {
1666         struct drm_fb_helper_connector *fb_helper_conn;
1667         int i;
1668         uint64_t conn_configured = 0, mask;
1669         int tile_pass = 0;
1670         mask = (1 << fb_helper->connector_count) - 1;
1671 retry:
1672         for (i = 0; i < fb_helper->connector_count; i++) {
1673                 fb_helper_conn = fb_helper->connector_info[i];
1674
1675                 if (conn_configured & (1 << i))
1676                         continue;
1677
1678                 if (enabled[i] == false) {
1679                         conn_configured |= (1 << i);
1680                         continue;
1681                 }
1682
1683                 /* first pass over all the untiled connectors */
1684                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1685                         continue;
1686
1687                 if (tile_pass == 1) {
1688                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1689                             fb_helper_conn->connector->tile_v_loc != 0)
1690                                 continue;
1691
1692                 } else {
1693                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1694                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1695                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1696                                 continue;
1697
1698                         /* find the tile offsets for this pass - need
1699                            to find all tiles left and above */
1700                         drm_get_tile_offsets(fb_helper, modes, offsets,
1701                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1702                 }
1703                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1704                               fb_helper_conn->connector->base.id);
1705
1706                 /* got for command line mode first */
1707                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1708                 if (!modes[i]) {
1709                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1710                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1711                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1712                 }
1713                 /* No preferred modes, pick one off the list */
1714                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1715                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1716                                 break;
1717                 }
1718                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1719                           "none");
1720                 conn_configured |= (1 << i);
1721         }
1722
1723         if ((conn_configured & mask) != mask) {
1724                 tile_pass++;
1725                 goto retry;
1726         }
1727         return true;
1728 }
1729
1730 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1731                           struct drm_fb_helper_crtc **best_crtcs,
1732                           struct drm_display_mode **modes,
1733                           int n, int width, int height)
1734 {
1735         int c, o;
1736         struct drm_device *dev = fb_helper->dev;
1737         struct drm_connector *connector;
1738         const struct drm_connector_helper_funcs *connector_funcs;
1739         struct drm_encoder *encoder;
1740         int my_score, best_score, score;
1741         struct drm_fb_helper_crtc **crtcs, *crtc;
1742         struct drm_fb_helper_connector *fb_helper_conn;
1743
1744         if (n == fb_helper->connector_count)
1745                 return 0;
1746
1747         fb_helper_conn = fb_helper->connector_info[n];
1748         connector = fb_helper_conn->connector;
1749
1750         best_crtcs[n] = NULL;
1751         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1752         if (modes[n] == NULL)
1753                 return best_score;
1754
1755         crtcs = kzalloc(dev->mode_config.num_connector *
1756                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1757         if (!crtcs)
1758                 return best_score;
1759
1760         my_score = 1;
1761         if (connector->status == connector_status_connected)
1762                 my_score++;
1763         if (drm_has_cmdline_mode(fb_helper_conn))
1764                 my_score++;
1765         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1766                 my_score++;
1767
1768         connector_funcs = connector->helper_private;
1769         encoder = connector_funcs->best_encoder(connector);
1770         if (!encoder)
1771                 goto out;
1772
1773         /* select a crtc for this connector and then attempt to configure
1774            remaining connectors */
1775         for (c = 0; c < fb_helper->crtc_count; c++) {
1776                 crtc = &fb_helper->crtc_info[c];
1777
1778                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1779                         continue;
1780
1781                 for (o = 0; o < n; o++)
1782                         if (best_crtcs[o] == crtc)
1783                                 break;
1784
1785                 if (o < n) {
1786                         /* ignore cloning unless only a single crtc */
1787                         if (fb_helper->crtc_count > 1)
1788                                 continue;
1789
1790                         if (!drm_mode_equal(modes[o], modes[n]))
1791                                 continue;
1792                 }
1793
1794                 crtcs[n] = crtc;
1795                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1796                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1797                                                   width, height);
1798                 if (score > best_score) {
1799                         best_score = score;
1800                         memcpy(best_crtcs, crtcs,
1801                                dev->mode_config.num_connector *
1802                                sizeof(struct drm_fb_helper_crtc *));
1803                 }
1804         }
1805 out:
1806         kfree(crtcs);
1807         return best_score;
1808 }
1809
1810 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1811 {
1812         struct drm_device *dev = fb_helper->dev;
1813         struct drm_fb_helper_crtc **crtcs;
1814         struct drm_display_mode **modes;
1815         struct drm_fb_offset *offsets;
1816         struct drm_mode_set *modeset;
1817         bool *enabled;
1818         int width, height;
1819         int i;
1820
1821         DRM_DEBUG_KMS("\n");
1822
1823         width = dev->mode_config.max_width;
1824         height = dev->mode_config.max_height;
1825
1826         crtcs = kcalloc(dev->mode_config.num_connector,
1827                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1828         modes = kcalloc(dev->mode_config.num_connector,
1829                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1830         offsets = kcalloc(dev->mode_config.num_connector,
1831                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1832         enabled = kcalloc(dev->mode_config.num_connector,
1833                           sizeof(bool), GFP_KERNEL);
1834         if (!crtcs || !modes || !enabled || !offsets) {
1835                 DRM_ERROR("Memory allocation failed\n");
1836                 goto out;
1837         }
1838
1839
1840         drm_enable_connectors(fb_helper, enabled);
1841
1842         if (!(fb_helper->funcs->initial_config &&
1843               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1844                                                offsets,
1845                                                enabled, width, height))) {
1846                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1847                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1848                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1849
1850                 if (!drm_target_cloned(fb_helper, modes, offsets,
1851                                        enabled, width, height) &&
1852                     !drm_target_preferred(fb_helper, modes, offsets,
1853                                           enabled, width, height))
1854                         DRM_ERROR("Unable to find initial modes\n");
1855
1856                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1857                               width, height);
1858
1859                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1860         }
1861
1862         /* need to set the modesets up here for use later */
1863         /* fill out the connector<->crtc mappings into the modesets */
1864         for (i = 0; i < fb_helper->crtc_count; i++) {
1865                 modeset = &fb_helper->crtc_info[i].mode_set;
1866                 modeset->num_connectors = 0;
1867                 modeset->fb = NULL;
1868         }
1869
1870         for (i = 0; i < fb_helper->connector_count; i++) {
1871                 struct drm_display_mode *mode = modes[i];
1872                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1873                 struct drm_fb_offset *offset = &offsets[i];
1874                 modeset = &fb_crtc->mode_set;
1875
1876                 if (mode && fb_crtc) {
1877                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1878                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1879                         fb_crtc->desired_mode = mode;
1880                         fb_crtc->x = offset->x;
1881                         fb_crtc->y = offset->y;
1882                         if (modeset->mode)
1883                                 drm_mode_destroy(dev, modeset->mode);
1884                         modeset->mode = drm_mode_duplicate(dev,
1885                                                            fb_crtc->desired_mode);
1886                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1887                         modeset->fb = fb_helper->fb;
1888                         modeset->x = offset->x;
1889                         modeset->y = offset->y;
1890                 }
1891         }
1892
1893         /* Clear out any old modes if there are no more connected outputs. */
1894         for (i = 0; i < fb_helper->crtc_count; i++) {
1895                 modeset = &fb_helper->crtc_info[i].mode_set;
1896                 if (modeset->num_connectors == 0) {
1897                         BUG_ON(modeset->fb);
1898                         if (modeset->mode)
1899                                 drm_mode_destroy(dev, modeset->mode);
1900                         modeset->mode = NULL;
1901                 }
1902         }
1903 out:
1904         kfree(crtcs);
1905         kfree(modes);
1906         kfree(offsets);
1907         kfree(enabled);
1908 }
1909
1910 /**
1911  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1912  * @fb_helper: fb_helper device struct
1913  * @bpp_sel: bpp value to use for the framebuffer configuration
1914  *
1915  * Scans the CRTCs and connectors and tries to put together an initial setup.
1916  * At the moment, this is a cloned configuration across all heads with
1917  * a new framebuffer object as the backing store.
1918  *
1919  * Note that this also registers the fbdev and so allows userspace to call into
1920  * the driver through the fbdev interfaces.
1921  *
1922  * This function will call down into the ->fb_probe callback to let
1923  * the driver allocate and initialize the fbdev info structure and the drm
1924  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1925  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1926  * values for the fbdev info structure.
1927  *
1928  * RETURNS:
1929  * Zero if everything went ok, nonzero otherwise.
1930  */
1931 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1932 {
1933         struct drm_device *dev = fb_helper->dev;
1934         int count = 0;
1935
1936         mutex_lock(&dev->mode_config.mutex);
1937         count = drm_fb_helper_probe_connector_modes(fb_helper,
1938                                                     dev->mode_config.max_width,
1939                                                     dev->mode_config.max_height);
1940         mutex_unlock(&dev->mode_config.mutex);
1941         /*
1942          * we shouldn't end up with no modes here.
1943          */
1944         if (count == 0)
1945                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1946
1947         drm_setup_crtcs(fb_helper);
1948
1949         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1950 }
1951 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1952
1953 /**
1954  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1955  *                               probing all the outputs attached to the fb
1956  * @fb_helper: the drm_fb_helper
1957  *
1958  * Scan the connectors attached to the fb_helper and try to put together a
1959  * setup after *notification of a change in output configuration.
1960  *
1961  * Called at runtime, takes the mode config locks to be able to check/change the
1962  * modeset configuration. Must be run from process context (which usually means
1963  * either the output polling work or a work item launched from the driver's
1964  * hotplug interrupt).
1965  *
1966  * Note that drivers may call this even before calling
1967  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1968  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1969  * not miss any hotplug events.
1970  *
1971  * RETURNS:
1972  * 0 on success and a non-zero error code otherwise.
1973  */
1974 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1975 {
1976         struct drm_device *dev = fb_helper->dev;
1977         u32 max_width, max_height;
1978
1979         mutex_lock(&fb_helper->dev->mode_config.mutex);
1980         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1981                 fb_helper->delayed_hotplug = true;
1982                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1983                 return 0;
1984         }
1985         DRM_DEBUG_KMS("\n");
1986
1987         max_width = fb_helper->fb->width;
1988         max_height = fb_helper->fb->height;
1989
1990         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1991         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1992
1993         drm_modeset_lock_all(dev);
1994         drm_setup_crtcs(fb_helper);
1995         drm_modeset_unlock_all(dev);
1996         drm_fb_helper_set_par(fb_helper->fbdev);
1997
1998         return 0;
1999 }
2000 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2001
2002 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2003  * but the module doesn't depend on any fb console symbols.  At least
2004  * attempt to load fbcon to avoid leaving the system without a usable console.
2005  */
2006 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2007 static int __init drm_fb_helper_modinit(void)
2008 {
2009         const char *name = "fbcon";
2010         struct module *fbcon;
2011
2012         mutex_lock(&module_mutex);
2013         fbcon = find_module(name);
2014         mutex_unlock(&module_mutex);
2015
2016         if (!fbcon)
2017                 request_module_nowait(name);
2018         return 0;
2019 }
2020
2021 module_init(drm_fb_helper_modinit);
2022 #endif